Mix all spices in a small bowl and rub all over both pieces of pork being sure to press those spices in.
Heat the Instant Pot to high and add apple cider vinegar. Carefully place all pork into pot. Cut them in half if necessary.
Set Instant Pot to cook on high for 30 minutes in the sealed position. When timer goes off let the pressure release naturally. (If you prefer more flavor you can saute the pork first.)
Carefully remove lid, remove pork and shred with two forks.
This pork has good flavor but you don't get a sauce. My kids like it this way then I can add salsa and toppings as needed.
Serve on a corn tortilla with lime juice, cojita cheese, avocado, cilantro, red onion and jalapenos.
For avocado crema, mix all ingredients in a blender. Serve on top of tacos.